I think the point is that -2C is not twice as cold as -1C, that would imply that -1C was infinitely more cold than 0C. An analogy is the same as seen with perc

I think the point is that -2C is not twice as cold as -1C, that would imply that -1C was infinitely more cold than 0C. An analogy is the same as seen with percentages. It's wrong to say, for instance, that 2% growth, it's double of 1% growth.